I think there's three different types of rudeness.
There is the joking around saying oh my god, your so rude.
Then theres the sarcasm part saying, oh no need to be rude about it.
Then theres just plain and simple rudeness, this could include; ignoring friends, offensive comments and meaning them, ignorance, being stuborn, only caring about yourself, false accusations, changing around other people, racism, threats, etc.
Drop it, please.
The boldness should give a big enough hint on why I wrote this.